Air filtration and visual barrier for enclosure with front-to-back airflow
An enclosure has a perforated front door with a replaceable filter, and a perforated rear side allowing air to flow through the enclosure. The enclosure also has mounting brackets for heat generating elements, such as line cards or other rack mounted electronics. A fan draws air through the perforated front door, though the filter, and across the heat generating elements. Side brushes are disposed on a side wall near the front of the enclosure, which allow any cables attached to the heat generating elements to exit the enclosure. The front door is removable, opening up one side of the side brushes and allowing the cables to slide in the side brushes while still connected to the heat generating elements.
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This application claims priority to U.S. Provisional Application No. 61/826,646, filed May 23, 2013, the entirety of which is incorporated herein by reference.
TECHNICAL FIELDThe present disclosure relates to providing airflow in data center or telecom networking enclosures.
BACKGROUNDTraditionally, most data center or telecom networking enclosures use either “90-degree turned front-to-back” or “side-to-side” airflow to cool the internal line card components. The “90-degree turned front-to-back” airflow design requires a dedicated air inlet area which is usually located on the lower front area of the enclosure. Once the air enters through this lower air intake, it needs to turn 90-degree up to go through all the vertically oriented line cards and the warm air finally exits through the rear exhaust area. The slightly simpler “side-to-side” airflow design requires perforation on both side walls of the enclosure as all line cards are placed in horizontal orientation. A fan tray is placed on one side of the enclosure to either blow or suck the air through the line cards to cool them.
In order to meet the air filtration requirement which is part of the stringent NEBS (Network Equipment Building System) industry standard, a removable foam filter is attached to the air inlet area of the enclosure. For the “90-degree turned front-to-back” enclosure design, a filter is attached on the bottom air intake area. For the “side-to-side” airflow enclosure design, a filter is attached to the side air intake area on the enclosure wall. Because the filter is placed well away from the busy line card area, it does not interfere with the line card operation or the network cable management that needs to be plugged to the line card's input/output ports. However, some of latest data center enclosures are now using the new airflow architecture design called “straight front-to-back” for the air to enter straight through the perforated line card face plates and exit through the rear fan trays. One of the key advantages of this design is that no valuable vertical or side rack space are wasted to provide the empty air baffling space for the air to turn or redirect. Still, this presents a challenge for the NEBS air filtration requirement since the entire front area of the enclosure now needs to be sealed with filters to keep dust out while still allowing the outside cables to be plugged into the line cards.
Overview
An enclosure has a perforated front door with a replaceable filter, and a perforated rear side allowing air to flow through the enclosure. The enclosure also has mounting brackets for heat generating elements, such as line cards or other rack mounted electronics. A fan draws air through the perforated front door, though the filter, and across the heat generating elements. Side brushes are disposed on a side wall near the front of the enclosure, which allow any cables attached to the heat generating elements to exit the enclosure. The front door is removable, opening up one side of the side brushes and allowing the cables to slide in the side brushes while still connected to the heat generating elements. In one example, the heat generating elements are computer and/or network equipment.
Example Embodiments
Referring first to
Front doors 150 are opened with handle 154 and swing out on hinges 152 to provide easy access to heat generating elements 210. In one example, heat generating elements 210 are network and/or computing equipment, such as network line cards, but any electronic equipment that requires cooling may be used as heat generating elements 210. In another example, perforated blanks 220 cover the racks that do not have heat generating elements 210 in them. Perforated blanks 220 may have handles to facilitate handling and mounting to enclosure 100.
Air flows in the direction of arrow 170 through perforations in front doors 150 and the enclosure rear 120 (show in
Enclosure 100 may be divided into sections for holding components that require differing levels of access in use. For example, the top section behind doors 150 may be configured to hold network line cards 210, which may need to be accessed relatively frequently. The bottom section 140 may be configured to hold a power supply, which does not need to be accessed as often. While two sections have been described and shown, in alternative examples, enclosure 100 may be divided into one section or more than two sections.
Referring now to
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In summary, and with reference again to
Front doors 150 have spring-loaded hinges 152 for easy and quick removal during line card 210 installation and they provide an easy attachment point for front foam filters 158. The open-front design of side brush filters 510 allows the entire network cable bundle 770 to be pre-plugged into line cards 210 and easily slide into the brush filament of side brushes 510. The entire front side of side brush 510 is completely open for cable bundles 770 to slide in easily during the installation of line card 210. This allows all network cables 770 to be plugged in to the ports 720 of line cards 210 prior to sliding the whole thing into enclosure 210. In one example, the side brushes are composed of short Nylon brushes 1110 (pre-mounted on u-channel metal rails 1120) sandwiched between two sheet metal brackets 522 and 524 with open front by using flat head rivets 530. The metal u-channel rail 1120 to which the Nylon filaments 1110 are attached also act as stiffeners to increase the overall rigidity of the design. This relatively simple but effective design provides a very rigid platform to which Nylon brushes 1110 are securely attached to the sheet metal parts while still allowing large network cable bundles 770 to slide in from the front. In this example, the entire cable management system 160, including the two outer sheet metal thickness, is only about ¼″ thick to provide a very clean and slim design. In addition to providing the NEBS-compliant air filtration, this system also solves the stringent government Federal Information Processing Standard (FIPS) compliance requirement. The FIPS requires a complete visual barrier on an enclosure in a government environment. Its main purpose is to prevent any bystanders from being able to see or identify any internal components and also provide evidence of tampering. The lockable doors along with front foam filter and side brush kit are more than sufficient to meet this stringent FIPS compliance requirement on enclosure 100.
Straight front-to-back airflow is a relatively new concept in the data center or telecom industry, and existing enclosures do not provide complete air filtration while still providing cable routing to the line cards. As described above, flat foam filters can be placed a certain distance away from the line cards' surfaces to provide the majority of air filtration that is going into the enclosure. Nylon filament brush, such as has been used by other industries to shield against debris and dust, has been used as a cable management solution. However, all existing brush designs used in the prior cable management systems have completely enclosed perimeter/walls around the brush, which only allows the tip of cables to pass through, but does not allow a cable bundle to be slid in. If the both of the cable's ends are already plugged in, it is impossible for the cable to be slid into the brush.
The above description is intended by way of example only. Any material described is only an example of a material that may be used. Other materials can be substituted without leaving the scope of the present invention. It is also to be understood that terms such as “left,” “right,” “top,” “bottom,” “front,” “rear,” “side,” “height,” “length,” “width,” “upper,” “lower,” “interior,” “exterior,” “inner,” “outer” and the like as may be used herein, merely describe points or portions of reference and do not limit the present invention to any particular orientation or configuration. Further, the term “exemplary” is used herein to describe an example or illustration. Any embodiment described herein as exemplary is not to be construed as a preferred or advantageous embodiment, but rather as one example or illustration of a possible embodiment of the invention.
Claims
1. An apparatus comprising:
- an enclosure comprising at least one removable, perforated front door on a front side of the enclosure, and a perforated rear wall opposite the front side of the enclosure;
- at least one filter mounted on the perforated front door and through which air is to be drawn through;
- a plurality of first mounting brackets configured to mount a plurality of heat generating elements within the enclosure; and
- a plurality of side brush filters, each of the plurality of side brush filters including a second mounting bracket with an open side configured to allow at least one cable to slide into the side brush filter.
2. The apparatus of claim 1, wherein the perforated rear wall is a rear surface of the enclosure.
3. The apparatus of claim 2, wherein the rear surface is configured to mount at least one fan.
4. The apparatus of claim 1, wherein the heat generating elements are network line cards.
5. The apparatus of claim 4, wherein the first mounting brackets are line card cages.
6. The apparatus of claim 1, further comprising a plurality of stiff filaments mounted on the at least one front door, and configured to cover the open side of each of the side brush filters.
7. The apparatus of claim 1, wherein each of the plurality of side brush filters is configured to allow at least one cable to slide into the side brush filter, such that only a middle portion of the cable makes contact with the side brush filter, and end portions of the cable do not make contact with the side brush filter.
8. The apparatus of claim 1, wherein the enclosure filters air entering the enclosure in compliance with Network Equipment Building System (NEBS) standards.
9. The apparatus of claim 1, wherein the enclosure with the at least one front door closed is configured to form a visual barrier that ensures the plurality of heat generating elements are not visible from outside the enclosure, and such that the enclosure complies with Federal Information Processing Standards (FIPS).
10. A method comprising:
- removing a perforated front door of an enclosure;
- partially installing a heat generating element into the enclosure;
- attaching at least one cable to the heat generating element;
- sliding the at least one cable into a side brush filter mounted on the enclosure, wherein the at least one cable is slid into an open side of the side brush filter;
- completing the installation of the heat generating element; and
- re-installing the perforated front door.
11. The method of claim 10, wherein attaching at least one cable to the heat generating element comprises attaching at least one network cable to a network line card.
12. The method of claim 11, wherein completing the installation of the heat generating element comprises sliding the network line card completely within the enclosure, such that the re-installed perforated front door can be closed.
13. The method of claim 10, wherein sliding comprises sliding the at least one cable so that only a middle portion of the at least one cable makes contact with the side brush filter.
14. The method of claim 13, wherein sliding the at least one cable comprises sliding the middle portion of the at least one cable into the open side of the side brush filter, such that end portions of the at least one cable do not make contact with the side brush filter.
15. An apparatus comprising:
- an enclosure comprising at least one removable, perforated front door on a front side of the enclosure, and a perforated rear wall opposite the front side of the enclosure;
- at least one filter mounted on the perforated front door and through which air is to be drawn through;
- a plurality of racks configured to mount a plurality of network line cards within the enclosure; and
- a plurality of side brush filters mounted on a common frame;
- wherein each of the plurality of side brush filters is configured to allow a bundle of network cables to exit the enclosure while substantially preventing dust from entering the enclosure.
16. The apparatus of claim 15, wherein the enclosure is configured to mount a fan to draw air through the enclosure.
17. The apparatus of claim 15, wherein the perforated front door is removable from the enclosure with at least one spring-loaded hinge.
18. The apparatus of claim 15, further comprising a power supply portion that is not accessible from the at least one perforated front door.
19. The apparatus of claim 15, further comprising a plurality of securing clips corresponding to the plurality of side brush filters.
20. The apparatus of claim 1, wherein the perforated front door is removable from the enclosure with at least one spring-loaded hinge.
7064957 | June 20, 2006 | Liang et al. |
D549089 | August 21, 2007 | Jun et al. |
7534167 | May 19, 2009 | Day |
7537517 | May 26, 2009 | Meserth et al. |
7656660 | February 2, 2010 | Hoeft et al. |
7826216 | November 2, 2010 | Moss |
8189348 | May 29, 2012 | Kadivar et al. |
8270171 | September 18, 2012 | Narasimhan et al. |
8403736 | March 26, 2013 | Rasmussen et al. |
8435057 | May 7, 2013 | Jun et al. |
8456840 | June 4, 2013 | Clidaras et al. |
8591300 | November 26, 2013 | Slessman et al. |
8675357 | March 18, 2014 | Namek et al. |
20070289776 | December 20, 2007 | Liang et al. |
20110086589 | April 14, 2011 | Skrepcinski et al. |
20110182036 | July 28, 2011 | Huang et al. |
20140206273 | July 24, 2014 | Larsen et al. |
Type: Grant
Filed: Aug 15, 2013
Date of Patent: Jun 23, 2015
Patent Publication Number: 20140345238
Assignee: Cisco Technology, Inc. (San Jose, CA)
Inventors: Frank S. Jun (San Jose, CA), Hong Tran Huynh (Fremont, CA), Vic Hong Chia (Sunnyvale, CA)
Primary Examiner: Duane Smith
Assistant Examiner: Minh-Chau Pham
Application Number: 13/967,751
International Classification: B01D 46/00 (20060101); H05K 7/20 (20060101); B01D 46/28 (20060101);